Some large cities are making Garborators illegal (that thing in your sink that grinds up food). The problem is that the garbage that goes down the drain has detrimental effects on water quality (don't ask me how!).
Instead of flushing all the organic material with the rest of the water, whenever the garborator is on, the water and garbage in it can go into a tank which can be used to water the lawn. You essentially have the same composting, possibly without the long delay from garbage to composte since the garbage is already ground up.
This also makes composting easier since it is more convenient to use a garborator than a composter. The composting tank can be tied into the sprinkler system so that your lawn/garden automatically gets fed mineral/protien rich water.
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Any water treatment utility should do composting. It would take some powerful tracking of contaminants to use the compost acceptable to farmers though.
I like it. Garborator is useful to grind organic waste into mush - smaller bits compost faster. Solids should be separated from liquid water somehow. Liquids should continue to go down the santitary sewer drain for municpal waste treatment. Solids go to your backyard black composter barrel that is rotated regularly. Finished result is a hands-free composting system that is used year round, saving smelly garbage going to landfill. Most components already exist but has someone constructed one already - would like to see plans.